Feed collet



, Oct. 25.1927. 1,646,771

I. H. SHEFFER FEED COLLET Filed Dec. 29, 1926 Patented Oct. 25, 1927.

U NI TED L STA. T ES PJAT OFTFII ravine n. snnrnnn, or nconsn nrenreanFEED COLLE'I:

, Application filed December 29, 1926. SerialLNo.,157,681.

This invention relates to improvements i 4 from the annular portion. 3and. is flexed feed collets generally employed. for feeding stockthrough hollow spindles of automatics or. other metal working machines,and has particular reference to feed collets provided with pads adaptedto come directly in contact with the stock.

It is an object of the invention to provide a one-piece feed collethaving a longitudinal resilient finger adapted to hold both sections ofthe pad in position within a front split collar integral with thecollet, and to provide supporting means extending partly around the padsections behind, and spaced from, the split collar so that the pad isheld against movement exceptfor the limited: amount permitted by theresiliency of the collet and its split collar and supportingineans.

Another object of the invention isto pro vide a feed collet having a padtherein which can be cheaply manufactured and speedily inserted orremoved.

\Vith these and other objects in view, the invention is hereinafter morefully described with the aid of the accompanying drawings, in which:

Figure 1 illustrates a side elevation of the invention, and

Figure 2 is an end view.

Figure 3 shows a plan view of Figure 1, and

Figures 4 and 5 are sections on the lines IVIV and VV of Figure 3.

Referring to the drawings, 1 designates the body of a feed collet havingits circumferentially closed back end 2 threaded so that it may beattached to an operating membernot shown. Adjacent to the threaded endof the collet is an annular portion 3 forwardly from which the latterarms 4 extend. The outer surfaces of these arms are preferably of thesame shape as the outer circum ference of the annular portion 8, and thearms are so spaced from one another as to leave a substantiallysemi-circular opening 5 between them for a purpose hereinafter setforth. The front ends of the arms terminate in a split collar 6.Circumferential support ing members 7 extend from each of the arms andon each side of the latter a short distance behind the split collar.These supporting members are each of such length that a gap 8 occurs oneach side of the collet between the members integral with one arm andthose 5 integral with the opposite arm. A resilient linger 9 extendsforwardly between the arms inwardlyslightly towards its frontunsupported end 10. This finger, which-usually.

projects substantially midway. around the circumference of the portion 3between the arms .4 and opposite the opening 5, also has acircumferential outer surface similar to the outersurface of theannular. portion 8 of which it. forms a part. The whole colletis usuallymade ofseamless tubing, and the unrequlred. portions are cut awayleaving the arms 4, finger 9, collar 6, and supporting members?allintegra'l with the annular portion. 3..

The pad 11, which, is generally made in two longitudinal.sections,isbored longitudinallly at 12w. suit the size and cross sec tion of thestock to be handled. Thefront end 13 of the pad is externally circularto fit within the split collar 6 and the supportmg member 7, andimmediately behind the latter the pad is externally rectangular as shownat 14: but with the corners 15 rounded so that they will not projectbeyond the sides of the collet. The shape of the back of the padprevents it form turning in the collet as the inner surfaces of the arms4 bear against one of the flat sides of each of the pad sections, andfuthermore a shoulder 16 is formed at the junction of the rectangularportion 14 with the circular portion 18 so that the back portions of thepad sections cannot pass forward within the supporting members 7. Thefront end 10 of the resilient finger 9 is flexed sufiiciently inwards tobear against a part of the back of both of the pad sections. In thismanner the sections are held against longitudinal movement in eitherdirection.

l/Vhen it is desired to remove the pad sections the finger 9 is flexedoutwardly until its end 10 is clear of the pad sections then the latterare moved back until they are behind the supporting members 7 .When theyreach that position it will be found that they can be removed throughthe opening 5.

'While in the foregoing the preferred embodiment of the invention hasbeen described and shown, it is understood that the construction hereindescribed is subject to such modifications as fall within the scope ofthe appended claims.

What I claim as my invention and desire to secure by Letters Patent is:

1. In a feed collet, a body circumferentially closed at one end,forwardly extending resilient finger.

collar andsaidmembers.

arms integral with said closed end, a split collar in which said armsterminate at the opposite end of said body, and circumferentialsupporting members; extending from each of said arms on each side of thelatter, said members being of such length that gaps are formed betweentheir outer ends, and a resilient finger extending from" saidclosed endbetween said armsin combination with alongitudinally"splitpad held by,said supporting members, said split collar, and said 2. In a feedcollet, a body circumferentially closed at oneend, forwardly extendingarms integral with said closed end, a split collar in which the frontends of said arms terminate, circumferential supporting members integralwith iand extending from each 7 side of said arms, and a resilientfinger eX- tending longitudinally'from said closed end, in combinationwitha' paddivided into two longitudinal sections and'supported by saidcollar and said members, said resilient finger bearing against the backofysaid split pad sections, and means for 'holdingsaid pad againstforward movement through said 3. In a feed collet, the combination asde-' sections each being substantially semi-circular towards the frontand adapted to slide through asplit collar of a feed collet, saidsections having shoulders behindsaid front semi-circular portionsadapted 'to against circumferential supporting members ofa feed colletby which the rear end of said semi-circular portions of said padsections are adapted to besupported, said pad sections having flatsexternally behind said shoulder two of which are adapted to rest onlongitudinal arms integral with said collet,and said pad sections whentogether having a longitudinal bore therethrough.

IRVING H. SHEFFER.

'bination oftwo longitudinal sections, said rest

